A resonant driver for a piezoelectric motor with single transistor direction switches

Abstract

A resonant driver for a Piezoelectric Motor (PZM) is presented, analyzed and tested experimentally. Following a short description of the linear PZM applied in this study, the paper covers the analytical relationships of the buck driven push-pull parallel resonant inverter stage that includes a novel single transistor direction switches. It is shown that the proposed topology is compatible with the drive requirements of the PZM powered from a low voltage (24V). It is also demonstrated that, unlike simple resonant converters, the proposed topology is relatively insensitive to the resonant component values and that it can tolerate added capacitance as introduced when connecting a PZM to the driver via a long cable.

Class-D amplifier design and performance for driving a piezo actuator drive servomotor

“…T HE The Piezoelectric Actuator Drive (PAD) is a new type of electrical motor that employs piezoelectric multilayer actuators which have inherent capacitive behavior [1]- [5]. The PADs internal structure is shown in Fig.…”

A self-adjusting sinusoidal power source suitable for driving capacitive loads

“…Another problem is the need to accommodate load changes (both the active and reactive parts) without affecting the amplitude, waveform and efficiency of the power driver. The current-fed push-pull resonant inverter (CFPPRI) [7] was shown earlier to be a useful topology for driving capacitive load [5]. However, the basic CFPPRI suffers from a number of drawbacks that will reduce the efficiency and increase distortion if the load capacitance or operating frequency is non-constant.…”

Analysis of the Current-Fed Push-Pull Parallel Resonant Inverter Implemented with Unidirectional Switches

“…For example, piezoelectric devices and in particular piezoelectric motors need to be driven by a high frequency sinusoidal waveform [1]. This is required since the optimal performance is obtained when the drive is of low harmonics contents.…”

“…This is required since the optimal performance is obtained when the drive is of low harmonics contents. The Current-Fed PushPull Parallel Resonant Inverter (CFPPRI) was shown earlier [1] to be a useful sinusoidal voltage source suitable for driving loads that are sensitive to the harmonics contents of the drive voltage. However, the basic CFPPRI operation is optimal only when the switching frequency is equal to the resonant frequency.…”